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FAIR VALUE MEASUREMENTS (Reconciliation of Acquisition-Related Contractual Contingent Liabilities Using Significant Unobservable Inputs) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Changes in fair value of contractual contingent liabilities recorded against goodwill     $ 200
Reclassification of contractual contingent liabilities out of Level 3     (3,789)
Level 3      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Contractual contingent liabilities, beginning of period $ 0 $ 0 5,364
Changes in fair value of contingent consideration included in Interest and other income, net (Note 2)     1,232
Settlements of contractual contingent liabilities     (8,955)
Increase/(decrease) in contractual contingent liabilities   0  
Effect of net foreign currency exchange rate changes (22)    
Contractual contingent liabilities, end of period 7,468 $ 0 0
Level 3 | Other Nonoperating Income (Expense) [Member]      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Changes in fair value of contingent consideration included in Interest and other income, net (Note 2) (900)    
Level 3 | Contractual Contingent Liability | Other Acquisitions      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Acquisition date fair value     800
Level 3 | Contractual Contingent Liability | Continuum      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Acquisition date fair value 2,400    
Level 3 | Contractual Contingent Liability | Think      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Acquisition date fair value $ 5,990    
Level 3 | Liability Classified Stock-Based Award      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Acquisition date fair value     $ 5,148